Since Mr. Brown left America, the condition of the fugitive slaves in his own country has, through the operation of the Fugitive Slave Law, been rendered so perilous as to preclude the possibility of return without the almost certain loss of liberty. His expatriation has, however, been a gain to the cause of humanity in this country, where an intelligent representative of the oppressed coloured Americans is constantly needed, not only to describe, in language of fervid eloquence, the wrongs inflicted upon his race in the United States, but to prevent their bonds being strengthened in this country by holding fellowship with slave-holding and slave-abetting ministers from America. In his lectures he has clearly demonstrated the fact, that the sole support of the slavery of the United States is its churches. This knowledge of the standing of American ministers in reference to slavery has, in the case of Dr. Dyer, and in many other instances, been most serviceable, preventing their reception into communion with British churches. Last year Mr. Brown succeeded in getting over to this country his daughters, two interesting girls twelve and sixteen years of age respectively, who are now receiving an education which will qualify them hereafter to become teachers in their turn--a description of education which would have been denied them in their native land. In 1834 Mr. Brown married a free coloured woman, who died in January of the present year. The condition of escaped slaves has engaged much of his attention while in this country. He found that in England no anti-slavery organization existed whose object was to aid fugitive slaves in obtaining an honourable subsistence in the land of their exile. In most cases they are thrown upon the support of a few warm-hearted anti-slavery advocates in this country, pre-eminent among whom stands Mr. Brown's earliest friend, Mr. George Thompson, M.P., whose house is rarely free from one or more of those who have acquired the designation of his "American constituents." This want has recently been attempted to be supplied, partly through Mr. Brown's exertions, and partly by the establishment of the Anglo-American Anti-Slavery Association. On the 1st of August, 1851, a meeting of the most novel character was held at the Hall of Commerce, London, being a soiree given by fugitive slaves in this country to Mr. George Thompson, on his return from his American mission on behalf of their race. That meeting was most ably presided over by Mr. Brown, and the speeches made upon the occasion by fugitive slaves were of the most interesting and creditable description. Although a residence in Canada is infinitely preferable to slavery in America, yet the climate of that country is uncongenial to the constitutions of the fugitive slaves, and their lack of education is an almost insuperable barrier to their social progress. The latter evil Mr. Brown attempted to remedy by the establishment of a Manual Labour School in Canada.